664100620 has 24 divisors (see below), whose sum is σ = 1455247584. Its totient is φ = 254090496.

The previous prime is 664100617. The next prime is 664100621. The reversal of 664100620 is 26001466.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (664100621) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 721389 + ... + 722308.

It is an arithmetic number, because the mean of its divisors is an integer number (60635316).

Almost surely, 2^664100620 is an apocalyptic number.

It is an amenable number.

664100620 is an abundant number, since it is smaller than the sum of its proper divisors (791146964).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

664100620 is a wasteful number, since it uses less digits than its factorization.

664100620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1443729 (or 1443727 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 664100620 is about 25770.1497861382. The cubic root of 664100620 is about 872.4581994900.

The spelling of 664100620 in words is "six hundred sixty-four million, one hundred thousand, six hundred twenty".